"iceberg basement" meaning in English

{
  "etymology_text": "So called because the greater part of an iceberg remains below sea level.",
  "forms": [
    {
      "form": "iceberg basements",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "iceberg basement (plural iceberg basements)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rooms",
          "orig": "en:Rooms",
          "parents": [
            "Buildings and structures",
            "Architecture",
            "Applied sciences",
            "Art",
            "Sciences",
            "Culture",
            "All topics",
            "Society",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2018 June 26, “Prince William, Kate Middleton's 'Ridiculous' Basement Expansion Sparks Debate”, in International Business Times:",
          "text": "According to Joe Gamp, a journalist for Express, Britons have complained about the palace's plan to build a two-story iceberg basement.",
          "type": "quote"
        }
      ],
      "glosses": [
        "An extensive luxurious basement added to a home to avoid the difficulties of building an extension above ground."
      ],
      "id": "en-iceberg_basement-en-noun-NXtyBguB",
      "links": [
        [
          "derogatory",
          "derogatory"
        ],
        [
          "extensive",
          "extensive"
        ],
        [
          "luxurious",
          "luxurious"
        ],
        [
          "basement",
          "basement"
        ],
        [
          "home",
          "home"
        ],
        [
          "extension",
          "extension"
        ]
      ],
      "raw_glosses": [
        "(UK, informal, derogatory) An extensive luxurious basement added to a home to avoid the difficulties of building an extension above ground."
      ],
      "tags": [
        "UK",
        "derogatory",
        "informal"
      ]
    }
  ],
  "word": "iceberg basement"
}

{
  "etymology_text": "So called because the greater part of an iceberg remains below sea level.",
  "forms": [
    {
      "form": "iceberg basements",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "iceberg basement (plural iceberg basements)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "English derogatory terms",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Rooms"
      ],
      "examples": [
        {
          "ref": "2018 June 26, “Prince William, Kate Middleton's 'Ridiculous' Basement Expansion Sparks Debate”, in International Business Times:",
          "text": "According to Joe Gamp, a journalist for Express, Britons have complained about the palace's plan to build a two-story iceberg basement.",
          "type": "quote"
        }
      ],
      "glosses": [
        "An extensive luxurious basement added to a home to avoid the difficulties of building an extension above ground."
      ],
      "links": [
        [
          "derogatory",
          "derogatory"
        ],
        [
          "extensive",
          "extensive"
        ],
        [
          "luxurious",
          "luxurious"
        ],
        [
          "basement",
          "basement"
        ],
        [
          "home",
          "home"
        ],
        [
          "extension",
          "extension"
        ]
      ],
      "raw_glosses": [
        "(UK, informal, derogatory) An extensive luxurious basement added to a home to avoid the difficulties of building an extension above ground."
      ],
      "tags": [
        "UK",
        "derogatory",
        "informal"
      ]
    }
  ],
  "word": "iceberg basement"
}